/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary: #1D3557;
      --secondary-light: #2B4A6E;
      --accent: #F4A261;
      --accent-light: #F9C78B;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --text-main: #1A1A2E;
      --text-sub: #6C757D;
      --border-light: #E9ECEF;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.12);
      --shadow-primary: 0 20px 60px rgba(230,57,70,0.25);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 8px;
      --font-title: 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.6;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
    }
    h1 { font-size: 48px; }
    h2 { font-size: 36px; }
    h3 { font-size: 24px; }
    h4 { font-size: 20px; }
    p { margin-bottom: 1rem; color: var(--text-sub); }
    a { text-decoration: none; color: inherit; }
    img { max-width: 100%; display: block; }
    button, .btn { cursor: pointer; font-family: var(--font-body); border: none; background: none; }
    
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(29, 53, 87, 0.92);
      backdrop-filter: blur(12px);
      z-index: 1000;
      transition: background 0.3s;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .navbar.scrolled {
      background: rgba(29, 53, 87, 0.98);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 900;
      font-size: 24px;
      color: white;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i { color: var(--accent); font-size: 28px; }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--accent);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--accent);
      transition: width 0.25s;
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 4px 12px rgba(230,57,70,0.3);
      white-space: nowrap;
    }
    .nav-cta:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(230,57,70,0.4);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      z-index: 1001;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--secondary);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 30px;
      z-index: 999;
    }
    .mobile-menu a {
      color: white;
      font-size: 24px;
      font-weight: 600;
    }
    .mobile-menu .nav-cta {
      font-size: 18px;
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: linear-gradient(180deg, #F8F9FA 0%, #FFFFFF 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      color: var(--secondary);
      margin-bottom: 18px;
    }
    .hero-left h1 span {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-sub);
      margin-bottom: 28px;
      line-height: 1.6;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.25s;
      box-shadow: 0 8px 24px rgba(230,57,70,0.25);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 32px rgba(230,57,70,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: #FFF0F0;
      border-color: var(--primary-dark);
    }
    .trust-stats {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 24px;
      font-weight: 700;
      color: var(--secondary);
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-sub);
    }
    .hero-right {
      flex: 1;
      position: relative;
    }
    .hero-right img {
      width: 100%;
      border-radius: 24px;
      box-shadow: var(--shadow-primary);
      transform: perspective(800px) rotateY(-3deg);
      transition: 0.3s;
    }
    /* 亮点网格 */
    .highlights {
      padding: 80px 0;
      background: var(--white);
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
      color: var(--secondary);
    }
    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--bg-light);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
      text-align: center;
    }
    .highlight-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 16px;
      transition: 0.3s;
    }
    .highlight-card:hover .highlight-icon {
      color: var(--accent);
      transform: scale(1.1);
    }
    .highlight-card h4 {
      margin-bottom: 8px;
      color: var(--secondary);
    }
    /* 案例瀑布 */
    .showcase {
      padding: 80px 0;
      background: var(--bg-light);
    }
    .masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .masonry-item {
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
      background: white;
    }
    .masonry-item img {
      width: 100%;
      display: block;
      transition: 0.4s;
    }
    .masonry-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      padding: 40px 20px 20px;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      color: white;
    }
    .masonry-overlay h4 {
      color: white;
      font-size: 20px;
      margin-bottom: 4px;
    }
    .masonry-item:hover img {
      transform: scale(1.05);
    }
    /* 对比表 */
    .compare {
      padding: 80px 0;
      background: white;
    }
    .table-wrapper {
      overflow-x: auto;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 700px;
      background: white;
    }
    .compare-table th {
      background: var(--secondary);
      color: white;
      padding: 18px 16px;
      font-weight: 600;
      text-align: center;
    }
    .compare-table th.recommend {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      position: relative;
    }
    .badge-rec {
      background: white;
      color: var(--primary);
      font-size: 12px;
      padding: 2px 8px;
      border-radius: 20px;
      position: absolute;
      top: -10px;
      right: 10px;
      font-weight: 700;
    }
    .compare-table td {
      padding: 16px;
      border-bottom: 1px solid var(--border-light);
      text-align: center;
    }
    .compare-table tr:hover td {
      background: #FFF5F0;
    }
    /* FAQ */
    .faq {
      padding: 80px 0;
      background: var(--bg-light);
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--secondary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
      color: var(--text-sub);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    /* CTA */
    .cta-banner {
      background: var(--secondary);
      padding: 80px 0;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .cta-banner::before {
      content: "";
      position: absolute;
      right: -20px;
      bottom: -40px;
      width: 280px;
      height: 280px;
      background: url('/assets/images/backpic/back-1.webp') no-repeat center/contain;
      opacity: 0.2;
    }
    .cta-banner h2 {
      color: white;
      margin-bottom: 16px;
    }
    .cta-banner .btn-primary {
      margin-top: 20px;
    }
    /* Footer */
    .footer {
      background: #15273F;
      color: #ADB5BD;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer a {
      color: #ADB5BD;
      display: block;
      margin-bottom: 8px;
      transition: 0.2s;
    }
    .footer a:hover { color: var(--accent); }
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .highlight-grid { grid-template-columns: repeat(2,1fr); }
      .masonry { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      h1 { font-size: 36px; }
      .highlight-grid, .masonry { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .trust-stats { gap: 16px; }
    }